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B-physics trigger: add additional selection for the close-by electron in R(K*) bBeeM6000 chains (ATR-28162)

Vladimir Lyubushkin requested to merge lyubushk/athena:bBKee into main

This MR will reduce the rate of the following bBeeM6000 chains, needed for R(K*) analysis:

  • HLT_e5_lhvloose_bBeeM6000_L1BKeePrimary (rate from 115Hz -> ~40Hz, 65% reduction)
  • HLT_e5_lhvloose_bBeeM6000_L1BKeePrescaled (rate from 1.4Hz -> 0.4Hz, 70% reduction)

The close-by electron should pass the same ET requirement as HLT_e5_lhvloose. This will harmonize the HLT dielectron selection and subsequent offline analysis.

CC @abarton @jakoubek @dmankad

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